(;AB[qr]AB[qq]AB[pq]AB[pr]AB[rn]AW[or]AW[oq]AW[pp]AW[np]AW[mr]AW[rl]AW[ql]AW[pl]AW[ol]AW[nm]C[White to topple over Black's 5-horse chariot!Hint: White's outside will be strong enough to contain Black, so causing a stir inside should be fine for White.]AP[goproblems];W[rp];B[qp]
(;W[ro];B[qn]C[Black 4 is the strongest reply. Now what?];W[qo];B[po];W[op];B[on]C[Tesuji needed!];W[rs];B[rr];W[ps]
(;B[sr]C[One more key move needed to topple the chariot.];W[so]
(;B[sn]
(;W[oo]C[CHOICE];B[pn];W[qs]C[Congratulations! Black's horses are now dead.RIGHT])
(;W[qs];B[sp]
(;W[sq];B[rq];W[ss]C[RIGHT])
(;W[oo];B[rq])
(;W[rq];B[sq])))
(;B[sp];W[qs];B[rq]C[ko]))
(;B[qs]C[ko]))
(;W[qo];B[ro]C[Black lives...]))